What are the emergency procedures for overpressure in a pressure vessel?

1. Immediately shut down and cut off the pressure source: Quickly stop the equipment, close the inlet valve, or cut off the source of the pressure increase to prevent the situation from worsening.

2. Open the pressure relief device: Release the pressure through the safety valve, vent valve, or emergency discharge valve. If manually opening the safety valve is ineffective, quickly open other valves that can safely relieve pressure.

3. Cool down: Take measures such as spray cooling, increasing the flow rate of cooling medium, or introducing inert gas to reduce the temperature and mitigate the risk of overheating.

4. Check safety accessories: Confirm that the safety valve, pressure gauge, thermometer, etc., are functioning properly. If they are malfunctioning, manual intervention is required and repairs should be carried out afterward.

5. Evacuation and reporting: Evacuate personnel from the hazardous area, report to the safety management department, activate the emergency plan, investigate the cause and repair it to ensure safe operation afterwards.

Special Note: For reaction vessels, feed should be stopped; for toxic, flammable, and explosive media, the vent pipe must be opened to discharge the media to a safe location. During operation, it is imperative to ensure personnel safety and prevent secondary accidents.